Overload circuit-opener.



lE. 0. SCHWEITZER. OVERLOAD CIRCUIT OPENER. APPLICATION FILED APR.2I, IsIa.

1,214,718. Patented Feb. 6, 1917.

f5 EN UNITED sTnTEs PATENT oEEicE.

EDMUND 0. ,SCHWEITZER, 0F CHICAGO, ILLINOIS.

OVERLOAD CIRCUIT-OPENER.

Specification of Lettersv Patent.

Application led Apri121', 1913. .Serial No. 762,463.

To all 'whom t may concern: y

Be it known that I, EDMUND O. SCHWEIT- ZEE, a citizen of the United States, residing at Chicago, in the county of Cook and State y of Illinois, have invented a certain new and useful Improvement in Overload Circuit- Openers, of which the following is a full, clear, concise, andexact description, reference being had to the accompanying draw# ings, forming a part of this specification.

My invention relates to overload circuit openers.

Prominent objects of the invention are to provide a simple, practical, and eilicient type of overload circuit opening arrangement; to permit the opening of a circult upon an overload in another circuit or apparatus; to

permit the opening of' a circuit upon anoverload either 1n that circuit or 1n another circuit or apparatus; to provide an eilicient and effective arrangement for controlling overload currents in a multiphase system;`

and to Asecure the foregoing and other desirable results in a Simple and expeditious manner.

In the accompanying drawings I show my invention applied to a S-phasesystem, but

it will be understood that the invention can,

be applied to other apparatus and in other ways. r

In the accompanying drawings, Figure y1 is a view illustrating a multiphase system and a motor therein, and an overload circuit opening arrangement embodying my present invention; Fig. 2 is a view of a de tail of construction; Figsp3, 4 and 5 are views of modi-fied forms of detail construc-v tion; and Fig. 6 is a view similar to Fig. -l

of a modified arrangement of the invention. In the accompanying drawings, and es pecially in Figs. 1 and 2, a S-phase system with conductors l, 2 and 3 is shown, said conductors leading to a motor 4. In each of the conductors 1, 2 and 3 are located fuses 5,

- Patentedreb. e, 191,7.

owing in said coils, 6"L and 6b. Thecoils 6, 6a, and 6b are preferably connected so asl to receive current from the circuits or conductors other than the circuits or conductors containing the fuses which said coils respectively include. As one arrangement I show in Fig. 1 the coil 6 for the fuse 5 in -conductor 1 connected by conductors 7 and 8 in shunt with conductor 3; the coil 6L for fuse 53L included by conductors 9 and 10 in shunt with conductor 1 and also coil 6? for fuse 5b connected by conductors 1l and 12 in shunt with conductor 2. Thus the fuse 5,

for example, may be operated by an over-r load current in conductor 2 because of the coil 6 receiving current from the circuit including conductor 2. Similarly fuse 5iL may be operated by an overload current incon-v ductor 2, and also an overload current in conductor l, and also fuse 5b may be operand valso byl an overload current in conduc- I 'ated byanxoverloa'd current in conductor 3,

tor 2. Thus it will be seen that if for eX- l ample an overload current in conductor 1 should operateor blow fuse 5, butv the other conductors and 3 of the system were not receiving sufficient overload current to blow the fuses 5a and 5", respectively, as for ex-v ample where` said fuses take more current than they shoul`d,vas sometimes happens, the

overload; current in conductor l would toA some extent persist notwithstanding the blowing of the fuse 5, and. would pass by conductors 9 and 10 Ythrough coil 6av and thereby produce a heating effect upon fuse 5a in conductor 2, which heatingeii'ect together with the load in fuse 5 would op# l erate the latter, and thereby cut out the motor; Thus the entire system would be f'ully protected by the operation-of the fuses in connection with the coils 6, 6iL and 6b, it being understood that the latter are sufficiently,

fine to burn out when the fuseswithfwhich they are associated have operated. Thus it/ will be seen that full protection may be accorded to apparatus on 3-phase or polyphase systems, and so serious damage and inJury may be prevented upon such systems where previously it has occurred by reason of the operation of the fuse in one line and thefailure of the fuses in the other lines to operate.

In Fig. 2 I show one way in which the fuses 5, 5a and 5b may be associated with the coils 6, 6a, and 6b. Fig. 2 shows a4 fuse of more or less usualtypehaying 'apertures oi' slots lt andl tor connection with`binding posts or terminals and av coil of wire 6 around about said fuse' and especially the middle portion thereof, layers l@ of inica or other material being placed on opposite sides ofthe tuse to accommodate the Wire Windings. lin Fig. 6' l show 'a3-phase system similar to that shown in Fig. l, but in this arrangement thecoils 6, 6a and 6b are conneited-.s'oinewhat diderently. For example these'ooils 6, 6a and 6b are connected by conductors 18, 19 and20 in a series parallel arductors l, 2 and 3, as shown.

rangement With'theniseli'es and the Y line cori-v lln Figs. 3, 'fil and 5 areshown arrangenients by which theinvention inay be applied to inclosed iuses. iin Fig. 3, for elimine` ple, is a cylindric'inclosed' fuse 2l having a 2O cylindric sleeve or housing 22 applied to, it, a heating coil toi' nieltingdhe inclosed fuse being arranged in or carried bythe sleeve 22, the ends ot said coil being connected by conductors 23 and 2d. t

ln t l show an inclosed fuse 25, iii

which the interior fuse proper 26 is surrounded by a heating coil 27, trom which connecting conductors' 2,8V and 29 'are en#l tended. y

ha F ig. 5 l show an inclosed fuse 30 containing va glass tube 3l in which a fuse 32 is extended, the glass tube 3l being surrounded a naief/ie by a heating coil 533, to which connection may be made by conductors 34 and 35;

lt will be understood that my invention may be applied and used invWays other than those shown hereinjand that changes and inodiiications can be niade `in `the structures herein Without departing from the spirit of the invention.

What l claiin is: l. The combination of several circuits, a

fuse' included in onecircuit, and a heating' coil for operating said t'use included 1n shunt another circuit.

'- 3. The combination with a polyphase system having its line conductors provided with fuses, of heating coils in heating proximity to said fuses and circuit connections connecting said heating coilsin shunt with line conductors other than those in which the fuses are respectively included.

ln Witness whereof, l hereunto subscribe niy n/aine thislSth day of April, A. D., 1913.

nni/iniin' o. soiiiifni'rann.

, Witnesses :V p

LA. L. JONES, y Hfizni. ANN' dorms: 

